Two of these are similar to a mailing address. If I move I need to a dozen different websites and services with my mailing address. Since it's not often I don't

Two of these are similar to a mailing address. If I move I need to a dozen different websites and services with my mailing address. Since it's not often I don't remember to track where this needs to happen. If I was forced to change my email address, I might not be able to recover some accounts. Some don't support changing username (which is my email). I don't want to count the number of websites I'd need to update.